2023MNRAS.522..559O

Query : 2023MNRAS.522..559O

2023MNRAS.522..559O - Mon. Not. R. Astron. Soc., 522, 559-571 (2023/June-2)

18O/17O abundance ratio towards a sample of massive star-forming regions with parallax distances.

OU C., WANG J., ZHENG S., LI J., ROMANO D. and ZHANG Z.-Y.

Abstract (from CDS):

The 18O/17O abundance ratio is, in principle, a powerful tool to estimate the relative contributions of massive stars and low- to intermediate-mass stars to the chemical enrichment of galaxies. We present 18O/17O ratios derived from simultaneous observations of C18O and C17O 1-0 towards 51 massive star-forming regions with the Institut de Radioastronomie Millimétrique (IRAM) 30 m telescope. Simultaneous observations of HC18O+ 1-0 and HC17O+ 1-0 with the Yebes 40m telescope towards five sources from this sample were also done to test the consistency of 18O/17O ratios derived from different isotopic pairs. From our improved measurements, resulting in smaller errors than previous work in the literature, we obtain a clear trend of increasing 18O/17O ratio with increasing Galactocentric distance (DGC), which provides a significant constraint on Galactic chemical evolution (GCE) models. Current GCE models have to be improved in order to explain the observed C18O/C17O 1-0 gradient.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: evolution - ISM: abundances - Galaxy: abundances - Galaxy: evolution

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LDN 1287 DNe 00 36 47.5 +63 29 02           ~ 103 0
2 NGC 281 HII 00 52 25.1 +56 33 54           ~ 251 1
3 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
4 IRAS 05137+3919 Cld 05 17 13.3 +39 22 14           ~ 75 0
5 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
6 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 270 3
7 IC 2162 HII 06 13 04.1 +17 58 44           ~ 372 2
8 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
9 V* VX Sgr s*r 18 08 04.0442790744 -22 13 26.600899044 11.72 9.41 6.52 3.90 2.11 M8.5Ia 622 0
10 W 31 SFR 18 10 28.6 -19 55 51           ~ 280 0
11 GAL 012.89+00.49 HII 18 11 51.3 -17 31 29           ~ 217 0
12 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
13 IRC +10365 OH* 18 37 19.2583829328 +10 25 42.492195300       9.97   M9 157 0
14 IRC +00363 OH* 18 41 25.3189090296 -04 20 32.023784328       10.45   M4 44 0
15 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
16 W 43s Rad 18 47 41.68 -02 00 24.3           ~ 30 0
17 W 49n HII 19 10 13.2 +09 06 12           ~ 497 3
18 OH 043.796-00.127 Mas 19 11 53.9868 +09 35 50.325           ~ 89 0
19 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
20 W 51m Rad 19 23.7 +14 30           ~ 72 0
21 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 194 0
22 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
23 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
24 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
25 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
26 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1

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